Michael, I don't know... The author is also a diyAudio member if you want to reach out for clarification. For me, I am just interested in the linear phase XO.
Juhazi, good suggestion!
Juhazi, good suggestion!
Active EQ of Unity horns...
I have a pair of Yorkville U15 set up as active. I too use REW, but never got credible timing info from it, probably due to hardware limitations or just I didn't set up correctly. I fine tuned my set-up more or less as follows:
The frequency response is fairly easy. You should level match your drivers at the crossover points. Having done that, how then to set time delay (if needed) between drivers?
The most important are the mids and highs, due to sensitivity of hearing acuity. My mid-high XO is at 1000 Hz. Here is what I did: as I understand it, just tuning by ear is not going to be too reliable.
The technique "invert one of the drivers" and then to feed it a tone at the x-over frequency, and then to tune for a minimum MAY work, but you may be off by an error factor. Rather than use a sine wave, pink noise works for some folks. What I did was a tiny bit more complicated:
In an audio editor (I use Audacity), make a very short amplitude "chirp" at your x-over frequency (e.g. 1K HZ). Then play this looped to your tweeter and mid, inverting polarity of either. Then tune for minimum amplitude of this test chip. This "should" give you very good alignment time-wise.
Repeat for x-over frequencies and pair of mid, woofer, etc.
Either it works, or I have deluded myself into thinking I have a well-aligned system 😀
I have a pair of Yorkville U15 set up as active. I too use REW, but never got credible timing info from it, probably due to hardware limitations or just I didn't set up correctly. I fine tuned my set-up more or less as follows:
The frequency response is fairly easy. You should level match your drivers at the crossover points. Having done that, how then to set time delay (if needed) between drivers?
The most important are the mids and highs, due to sensitivity of hearing acuity. My mid-high XO is at 1000 Hz. Here is what I did: as I understand it, just tuning by ear is not going to be too reliable.
The technique "invert one of the drivers" and then to feed it a tone at the x-over frequency, and then to tune for a minimum MAY work, but you may be off by an error factor. Rather than use a sine wave, pink noise works for some folks. What I did was a tiny bit more complicated:
In an audio editor (I use Audacity), make a very short amplitude "chirp" at your x-over frequency (e.g. 1K HZ). Then play this looped to your tweeter and mid, inverting polarity of either. Then tune for minimum amplitude of this test chip. This "should" give you very good alignment time-wise.
Repeat for x-over frequencies and pair of mid, woofer, etc.
Either it works, or I have deluded myself into thinking I have a well-aligned system 😀
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Proper method for capturing measurement data for XO simulation with REW in reflecting environment e.g. indoors at home:
https://kimmosaunisto.net/Software/VituixCAD/VituixCAD_Measurement_Preparations_REW.pdf
Document is preliminary i.e. all details are not double checked, but should be okay.
Other than direct radiators smaller than 15" may require far field measurement distance longer than 100 cm. For example 150 cm has been okay for mid-range horns. Rotation center while off-axis sequence should be in the center point (X,Y) on mouth level (Z) of horn.
Other than direct radiators need adequate time window because near to far field conversion with baffle diffraction simulation is not necessarily available.
https://kimmosaunisto.net/Software/VituixCAD/VituixCAD_Measurement_Preparations_REW.pdf
Document is preliminary i.e. all details are not double checked, but should be okay.
Other than direct radiators smaller than 15" may require far field measurement distance longer than 100 cm. For example 150 cm has been okay for mid-range horns. Rotation center while off-axis sequence should be in the center point (X,Y) on mouth level (Z) of horn.
Other than direct radiators need adequate time window because near to far field conversion with baffle diffraction simulation is not necessarily available.
Thank you all for the inputs. I have homework to do. The nice thing is that setting the DSP is fast and easy I will also try the LR2 and compare to the JMLC style. In the weekend, I did just some measurements around the LR4 setup without delays - and there is definitely interference from the time shift, which disappears after the drivers are time aligned.
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